Crossword Genius

Where you might find turtle up a gum tree? (2,3,4)

Ross

I believe the answer is:

in the soup

I'm a little stuck... Click here to teach me more about this clue!

'where you might find turtle' is the definition.
The definition suggests a singular noun but the answer is not.

'up a gum tree?' is the wordplay.
I cannot really understand how this works, but
'up' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for in the soup that I've seen before include "Suffering difficulties" , "Noodles may be" , "where the stock might end up" , "Experiencing serious difficulties" , "amid trouble" .)

I've seen this clue in The Times.
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